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Population structure and life history characteristics of the freshwater crayfish Gramastacus insolitus and Geocharax falcata (Parastacidae) in the Grampians National Park, Australia

Johnston, Kerrylyn, Robson, Belinda J. and Austin, Christopher M. 2010, Population structure and life history characteristics of the freshwater crayfish Gramastacus insolitus and Geocharax falcata (Parastacidae) in the Grampians National Park, Australia, Freshwater crayfish, vol. 17, pp. 245-253.

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Title Population structure and life history characteristics of the freshwater crayfish Gramastacus insolitus and Geocharax falcata (Parastacidae) in the Grampians National Park, Australia
Author(s) Johnston, Kerrylyn
Robson, Belinda J.
Austin, Christopher M.ORCID iD for Austin, Christopher M. orcid.org/0000-0003-1848-6267
Journal name Freshwater crayfish
Volume number 17
Start page 245
End page 253
Total pages 9
Publisher International Association of Astacology
Place of publication United States
Publication date 2010-12-01
ISSN 2076-4324
2076-4332
Summary Means by which freshwater crayfish persist in seasonally-dry wetlands are poorly understood, but this information is important for their management and conservation. This study examined the population structure, reproductive timing, and life history strategies of two Australian freshwater crayfish species that have a commensal relationship, through seasonal surveys conducted once in each season over 24 months. Gramastacus insolitus is able to achieve large population densities in ephemeral waterbodies but lacks the capacity to burrow, while Geocharaxfalcata can burrow to survive annual drying. Higher abundances were generally recorded in spring and summer than other times of year for both species. Sex ratios in G insolitus almost always favoured females, sexually mature females were 7.2 mm OCL or larger and gravid females were captured in the highest abundances in spring. Preparatory moulting, spawning, brooding of eggs and release of juveniles occurs in both species over the period of late winter to late summer. Both species have the life history characteristics of summer brooders such as: potentially asynchronous spawning regimes, short breeding periods, relatively short life spans, and the ability to grow rapidly. These traits demonstrate the flexibility required by freshwater crayfish to enable them to inhabit seasonally-dry wetlands where the timing and duration of inundation of these habitats is unpredictable. © 2010 International Association of Astacology.
Language eng
Field of Research 060204 Freshwater Ecology
Socio Economic Objective 970105 Expanding Knowledge in the Environmental Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2010, International Association of Astacology
Persistent URL http://hdl.handle.net/10536/DRO/DU:30091348

Document type: Journal Article
Collections: School of Life and Environmental Sciences
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